यदि \(a_1=60\) और (a_{n+1}=a_n-n(n+1)) है तो \(a_4\) क्या होगा?
If \(a_1=60\) and (a_{n+1}=a_n-n(n+1)), what is \(a_4\)?
Explanation opens after your attempt
A. (40)
Concept
The terms are (60,58,52,40), so \(a_4=40\). Exam tip: calculate the product and then subtract.
Why this answer is correct
The correct answer is A. (40). The terms are (60,58,52,40), so \(a_4=40\). Exam tip: calculate the product and then subtract.
Exam Tip
पद (60,58,52,40) हैं इसलिए \(a_4=40\) है। गुणनफल निकालकर घटाएँ।
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